BLDX-434 | Migrate to `msgspec.Struct` models#811

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Aryamanz29 wants to merge 14 commits intomainfrom

Commits on Feb 15, 2026

Commits on Feb 19, 2026

[chore] remove dead code and restructure pyatlan_v9 directory
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[feat] Migrate remaining model files to msgspec.Struct
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[feat] Migrate AtlanClient to msgspec.Struct
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[test] port and update v9 unit tests for parity
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[feat] Implement custom validate_arguments decorator replacing pydantic
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[test] Update test assertions for custom validate_arguments decorator
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[fix] Move validate.py to pyatlan/ to resolve circular import and fix v9 test failures
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[refactor] Make client layer natively support both Pydantic and msgspec models
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[change] Remove duplicated dataclass/enum models, re-export from legacy
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[change] Migrate TaskSearchRequest/FluentTasks, DataContractSpec yaml, test parity
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[feat] Migrate v9 models and tests: events, packages, open lineage, DQ rules, lineage
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